Modular ZT Drive Layout for Frame Flexion and Torsional Loads
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Solution Overview
Problem
Existing drive systems for zero turn radius (ZT) vehicles face challenges in flexibility and efficiency due to rigid structures that are prone to torsional loads as the vehicle frame twists and flexes, leading to duplication of drive system components and limited drive options.
Innovation Solution
A modular power distribution and drive system with a central gearbox that allows flexible joining of left and right side drive mechanisms, accommodating various drive types and configurations, including hydraulic, toroidal, and mechanical drives, using a central drive train and power take off mechanism with a clutch that can be manual, hydraulic, or electric, enabling 'plug-and-play' functionality and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If integrated drive units with rigid structures are used to eliminate duplication of components, then device complexity is reduced, but the system becomes vulnerable to torsional loads and frame flexion
Solution Approach 1:
The patent applies flexible coupling elements and flexible mounting arrangements that allow the drive unit to accommodate frame flexion and torsional loads. The flexible coupling transmits power while compensating for relative movements between the frame and drive unit, thus maintaining reliability without increasing component duplication.
2Adaptability or versatility
If separate hydraulic pump and wheel motor combinations are used under individual control, then adaptability and drive options are improved, but device complexity and component duplication increase
Solution Approach 1:
The patent employs a universal integrated drive unit that can function in multiple configurations. The same basic drive unit structure can be adapted for different drive mechanisms (hydraulic, electric, mechanical) through modular components and flexible coupling arrangements, providing versatility without requiring completely separate systems for each drive type.
3Volume of moving object
If rigid integrated drive units spanning the vehicle width are used, then space economy is improved, but the system cannot accommodate frame flexion and twisting
Solution Approach 1:
The patent transforms the static rigid connection into a dynamic flexible coupling system. The flexible coupling allows relative movement and deformation to accommodate frame flexion while maintaining power transmission, enabling the compact drive unit layout to adapt to changing geometric conditions during vehicle operation.
Data Source
AI summary
A vehicle having a prime mover and a central gear box mounted to a frame. First and second transaxles are driven by the central gear box. Each transaxle includes an output axle having a completely splined external portion and a threaded end for engagement with a driven wheel, and the completely splined portion of each output axle is disposed in one of the driven wheels of the vehicle. A cross brace may be mounted to the two transaxle housings for rigidity.